public bool RemoveItemDB(string id, string username)
{
int ProductID = Convert.ToInt32(id);
emptyCart = false;
try
{
//get user's cart with status not checkout
var userOrderID = db.Orders
.Where(o => o.CustomerID.Equals(username) && o.OrderStatus == (int)Enumeration.OrderStatus.InCart)
.Select(o => o.OrderID)
.FirstOrDefault();
//=====================================================================
if (userOrderID == 0) //currently dont have any cart => can not remove
{
return(false);
}
//=====================================================================
else //have cart => check if item have in cart
{
var quantity = db.OrderDetails
.Where(d => d.OrderID == userOrderID && d.WatchID == ProductID)
.Select(d => d.Quantity).FirstOrDefault();
//========================
if (quantity == 0) //item not existed in order || item auto become 0 =>
{
OrderDetail detail = db.OrderDetails.Find(ProductID, userOrderID);
db.OrderDetails.Attach(detail);
db.OrderDetails.Remove(detail);
int resultDetail = db.SaveChanges();
if (resultDetail > 0)
{
//check if cart is empty => to refresh page
var itemInCart = db.OrderDetails
.Where(d => d.OrderID == userOrderID)
.Select(d => d.WatchID)
.ToList();
if (itemInCart.Count != 0)
{
return(true); //still have item in cart in OrderDetail DB
}
var curEmptyOrder = db.Orders.Find(userOrderID);
db.Orders.Attach(curEmptyOrder);
db.Orders.Remove(curEmptyOrder);
db.SaveChanges();
emptyCart = true;
return(true); //success + empty cart!
}
else
{
return(false); //SaveChange fail
}
}
else //======================== have item in cart => remove item
{
OrderDetail detail = db.OrderDetails.Find(ProductID, userOrderID);
db.OrderDetails.Attach(detail);
db.OrderDetails.Remove(detail);
int resultDetail = db.SaveChanges();
if (resultDetail > 0)
{
//check if cart is empty => to refresh page
var itemInCart = db.OrderDetails
.Where(d => d.OrderID == userOrderID)
.Select(d => d.WatchID)
.ToList();
if (itemInCart.Count != 0)
{
return(true); //still have item in cart in OrderDetail DB
}
var curEmptyOrder = db.Orders.Find(userOrderID);
db.Orders.Attach(curEmptyOrder);
db.Orders.Remove(curEmptyOrder);
db.SaveChanges();
emptyCart = true;
return(true); //success + empty cart!
}
else
{
return(false); //SaveChange fail
}
}
}
}
catch (Exception)
{
return(false);
}
}
public bool AddToCartDB(string id, string username)
{
int ProductID = Convert.ToInt32(id);
var product = db.Watches
.Where(w => w.WatchID == ProductID)
.Select(p => new ShoppingProduct
{
ProductID = ProductID,
ProductCode = p.WatchCode,
ProductPrice = p.Price,
ProductPhoto = p.Thumbnail,
ProductDiscount = p.Discount
}).FirstOrDefault();
try
{
//get user's cart with status not checkout
var userOrderID = db.Orders
.Where(o => o.CustomerID.Equals(username) && o.OrderStatus == (int)Enumeration.OrderStatus.InCart)
.Select(o => o.OrderID)
.FirstOrDefault();
//=====================================================================
if (userOrderID == 0) //currently dont have any cart
{
//create new cart in DB
Order currentOrder = new Order();
currentOrder.CustomerID = username;
currentOrder.OrderStatus = (int)Enumeration.OrderStatus.InCart;
db.Orders.Add(currentOrder);
int result = db.SaveChanges();
if (result == 0)
{
failByQuantity = false;
return(false); //insert fail
}
//get orderID
var orderID = (int)db.Orders
.Where(o => o.CustomerID.Equals(username) && o.OrderStatus == (int)Enumeration.OrderStatus.InCart)
.Select(o => o.OrderID)
.First();
//check quantity of product in DB
bool checkQuantity = this.CheckAvailableAndQuantityInDB(ProductID, 1); //add new 1 item
if (!checkQuantity)
{
failByQuantity = true;
return(false);
}
//add new item to cart
OrderDetail detail = new OrderDetail();
detail.OrderID = orderID;
detail.WatchID = ProductID;
detail.Quantity = 1;
db.OrderDetails.Add(detail);
int resultDetail = db.SaveChanges();
if (resultDetail > 0)
{
return(true); //success
}
else
{
failByQuantity = false;
return(false);
}
}
//=====================================================================
else //have cart => check if item have in cart
{
var quantity = db.OrderDetails
.Where(d => d.OrderID == userOrderID && d.WatchID == ProductID)
.Select(d => d.Quantity).FirstOrDefault();
//========================
if (quantity == 0) //item not existed in order => add new item to cart, quantity = 1
{
//check quantity of product in DB
bool checkQuantity = this.CheckAvailableAndQuantityInDB(ProductID, 1);
if (!checkQuantity)
{
failByQuantity = true;
return(false); //add fail
}
//valid quantity => add new item to order detail
OrderDetail detail = new OrderDetail();
detail.OrderID = userOrderID;
detail.WatchID = ProductID;
detail.Quantity = 1;
db.OrderDetails.Add(detail);
int resultDetail = db.SaveChanges();
if (resultDetail > 0)
{
return(true); //success
}
else
{
failByQuantity = false;
return(false); //fail
}
}
else //======================== have item in cart => update quantity
{
//check quantity of product in DB
bool checkQuantity = this.CheckAvailableAndQuantityInDB(ProductID, quantity + 1);
if (!checkQuantity)
{
failByQuantity = true;
return(false); //add fail
}
OrderDetail detail = db.OrderDetails.Find(ProductID, userOrderID);
db.OrderDetails.Attach(detail);
detail.Quantity = quantity + 1;
int resultDetail = db.SaveChanges();
if (resultDetail > 0)
{
return(true); //success
}
else
{
failByQuantity = false;
return(false); //fail
}
}
}
}
catch (Exception)
{
failByQuantity = false;
return(false);
}
}